Artificial tooth.



F. SHBINMAN. ARTIFIGIAL TOOTH. APPLIOATION FILED JUNE 19,1908.

Patented Feb. 2, 1909.

ATTORNEYS UNITED stmrns PATENT orricn.

FREDERICK SHEINMAN, or NEW YORK, N. Y.

ARTIFICIAL TOOTH.

Specification of Letters Patent.

Patented Feb. 2,.1909.

Application filed. June 19, 1908. Serial No. 39,272.

' teeth facings, and the obiect thereof is to rovidea device of this 0 ass which can be acked with metal and secured.- in position on a bridge or similar-structure without the use of pins or similar devices at the back of the tooth or tooth facing. r

The invention is fully disclosed in the following specification, of which the accompanying drawing forms a part, in. which the separate parts of my improvement are designated by suitable reference characters in each, of the views, and in which:

' Figure 1 is a back view of an artificial tooth or tooth facing made according to my invention, "Fig; 2 is aside view thereof, Fig.1.? a cross sectionon the line 33 of Fig. 1, Fig. 4 a view similar to Fig.1 but showing a metal back applied to the tooth or tooth facing, Fig. 5 a cross section on the line 5-.5 of Fig. 4, Fig. 6 a view similar to Fig. 1, but

showing a different form of tooth, Fig. 7 a

side view of the tooth shown in Fig. 6, and,

Fi 8 a transverse section showing a plu-. ra ity' of teeth secured to a bridge. con-- lstruction.

v In the practice of invention as shown in Figs. 1 to 5 inclusive, I take an artificial *tooth or tooth-facing a of the usual or any preferred form, the tooth" or tooth facing shown being what is known as a cuspid, and

in the opposite sides of the back a of said tooth or tooth facing I form longitudinal and segmental recesses a the inner walls .of which are under-cut as shown at 0;, and said recesses or the inner walls thereof are concave so as to prevent-the tooth 01' tooth facing'from slipping in a bridge construction, and the front Walls thereof are parallel with the back face of the tooth or tooth facing, the recesses a. being formed in the side corners of, the tooth or tooth facing and not in the back thereof'only.

With the tooth or tooth facing pre ared as shown in Figs, 1 to 3 inclusive, a so t metal backing 1) shown in Figs. 4 and 5 may be easily applied to the back'of the tooth or tooth facing, said metal backin' being swaged into position and .into the grooves a and when the metalbacking b has been ap lied to the tooth or tooth facing as shown in ig. 5 it is locked thereto and the said tooth or tooth facing may be placed in a matrix, and a bridge or other work' cast thereon in the usual manner in order to give the tooth 01' tooth facing the desired strength and to secure said tooth or tooth facing to the bridge or othe structure.

It will be understood that the metal backing 1; is very thin and may be easily swaged to the back of the tooth or tooth facing and into the recesses a with a suitable tool so as to securely hold said backing on the tooth or tooth facing, and this may be done by the manufacturer of the tooth or tooth facing, or by a dentist or other operator after the tooth or tooth facing has been secured by him.

In Fig. 8 I have shown a number of teeth a I secured to a bridge work construction 0, and it will be understood that the operation performed in doing this is the same as with other teeth of this class. The teeth with the metal backing I) being first laced in a suitable mold or matrix into w ich the metal c to form the bridge or similar construction is cast.

In Figs. 6. and 7 I have shown at d what is known as a molar tooth, the back of which is provided with longitudinal grooves a the same as in Fi s. 1 to 5 inclusive.

' It is a well own fact that the custom of securing pins or similar devices in the backs of artificial teeth or teeth facings frequently results in cracking or checking said teeth or facin s, but- With my improvement-I avoid this ifiiculty, and at the same time provide an artificial tooth or tooth facing which may be rigidly and permanently secured in a 1. An artificial tooth or tooth-facing, the

ba.ck of which is provided in the opposite side ortions thereof with longitudinal recesses having backwerdly and laterally facing Walls,

the laterally facing wells being concave and 5 under-cut. y

2. An artificial tooth or tooth-facing, the back of which is rovided in. the oppositeside ortions thereof aving backwardly and laterally facing walls, 10 the laterally facing Wells being concave and under-cut, said'tooth or tooth facing being with longitudinal recessesalso provided with it thin metal back which is swaged thereto and into said recesses.

ence of the subscribing witnesses this 18th day of June, 1908.

FREDERlCK SHEINMAN.

Witnesses: r

A. It. APPLEMAN M. E. DOODY. 

